Certainly don't fault the tech crew with the issue of people being dropped in CHC, that is down to SOPs, runway issue with ZQN and local weather.
But unfortunately for the passengers, once they are off the flight, Jetstar appeared to drop the ball. But it has happened in the past with Air NZ getting road travel stuffed up with people stuck in busses when roads were closed unexpectedly. It does appear in NZ that Jetstar doesn't learn from these events.
It is good to have competition in the regions in NZ, but with only 5 Dash 8s it does appear to be more of a token effort going against a fleet of 48 Dash 8s and ATRs (by 2017).
If they had come in with 10 or 15 and been keen to operate to more destinations, then they would be a serious threat.